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1. Topband: Cable shields (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 11 Jul 2012 16:37:35 -0400; The statement CATV coaxial cables or cables with foil/drain shields do not have good shielding, because of transfer impedance and high resistance, was made a while ago here on this reflector. I think; /archives//html/Topband/2012-07/msg00130.html (6,970 bytes)
2. Re: Topband: Cable shields (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Wed, 11 Jul 2012 16:07:34 -0500; Very good, Tom. I still wonder what the answer is to my earlier question (in late June) about a flooded quad-shield coax with a corroded inner shield. I suspect with a bonded foil inner shield, not m; /archives//html/Topband/2012-07/msg00131.html (7,161 bytes)
3. Re: Topband: Cable shields (score: 1): Author: "Bill Wichers" <billw@waveform.net>; Date: Wed, 11 Jul 2012 17:28:37 -0400; I suspect the corroded foil would have little measurable effect on the coax's shielding effectiveness for lower frequencies. The foil is primarily there for the higher frequencies, the braid for the; /archives//html/Topband/2012-07/msg00132.html (8,078 bytes)
4. Re: Topband: Cable shields (score: 1): Author: DAVID CUTHBERT <telegrapher9@gmail.com>; Date: Wed, 11 Jul 2012 15:45:17 -0600; Tom, I don't doubt that you performed the cable TI measurement correctly but I have seen folks take data that is actually the TI of the test fixture and not the cables under test. What TI impedance d; /archives//html/Topband/2012-07/msg00133.html (7,977 bytes)
5. Re: Topband: Cable shields (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 11 Jul 2012 19:50:57 -0400; I can easily and quickly test any 8 foot length Mike. I just added a scrap from my old Dish network system that blew off the roof last week. _______________________________________________ UR RST IS; /archives//html/Topband/2012-07/msg00134.html (7,944 bytes)
6. Re: Topband: Cable shields (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 11 Jul 2012 20:35:09 -0400; I can put a number on that using two-year old indoor-use ComScope "Brite wire" ( I think that is what it said), which is a non-flooded dual shield (foil and braid). 160 -80 dB 80 -88 dB 40 -99 dB I; /archives//html/Topband/2012-07/msg00135.html (8,714 bytes)
7. Re: Topband: Cable shields (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 11 Jul 2012 20:48:23 -0400; I can't actually measure it Dave. I have a spare port on my test fixture that is identical to the sample port. When I swap my voltmeter over to that port and run 1 amp of RF current on the tested ca; /archives//html/Topband/2012-07/msg00136.html (7,903 bytes)

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